** When the KX-TA82481 is added to the KX-TA824 base unit, the system supports 5 Incoming CO Lines and 16 Extension / User Endpoints. You can add Caller ID to the new 2 incoming lines by adding card KX-TA82493.

** When the KX-TA82483 is added to the KX-TA824 base unit, the system supports 6 Incoming CO Lines and 16 Extension / User Endpoints. You can add Caller ID to the new 3 incoming lines by adding card KX-TA82493.